Sewing machine



March 10, 1942. e. A. FLECKENSTEIN SEWING MACHINE v Filed Oct. 24, 1939v 4 Shee ts-Sheet 1 GEORGE A. FLEckENsTE/N G. A. FLECKENSTEIN 2,276,246

SEWING MACHINE Filed on. 24, 1939 -March 10,' 1942.

4 Sheets-Sheet 2 GEORGE A. FL EOKEWS TE'IN March 10,- 1942. e. A.FLECKENSTEIN SEWING MACHINE Filed Oct. 24, 1939 4 Sheets-Sheet 3 GEORGEA. FLECKEIVSTE/IV March 10, 1942.

5. A. FLECKENSTEIN 2,276,246

SEWING MACHINE Filed Oct. 24, 1939 4She ets-Sheet 4 Patented Mar. 10,1942 UNITED STATES PATENT oFFlca sewmo MACHINE George A. Fleckensteln,Stratford, Conn., assignmto The Singer Manufacturing Company, Elizabeth,N. 1., a corporation of New Jersey Application Octobcr 24, 1939, SerialNo. 300,903

V, belt-pulley, the latter being carried by an outboard projection ofthe main-shaft.

An object of the present invention is to provide a simplifiedarrangement of shafting and gearing for such a machine within thelimited space available in the machine frame, using a small high speedmotor with a small driving pulley belted to a balance-wheel on amain-shaft so located as to afford a belt drive of adequate length whilekeeping the rim-of the balancewheel above the base-plate of the machineupon which'the bed. is fastened.

With the above and other objects in view, as will hereinafter appear,the invention comprises the devices, combinations and arrangements ofparts hereinafter set forth and illustrated in the accompanying drawingsof a preferred embodiment of the invention, from which the severalfeatures of the invention and the advantages attained thereby will bereadily understood by those skilled in the art.

f the accompanying drawings, Fig. l is a longitudinal vertical sectionthrough a sewing machine embodying the invention. Fig. 2 is a bottomplan view of the machine with the bottom or base-plate removed from themachine bed. Fig. 3 is a transverse vertical section through the bed andbracket-arm standard. Fig. 4 is a transverse vertical section throughthe machine bed, showing the bracket-arm head and needlemechanismtherein in elevation. Fig. 5 is a transverse vertical sectionsubstantially on the line 5-5, Fig. 2, and Fig. 6 is a transversevertical section substantially on the line 6-6, Fig. 2.

The machine is formed with a frame including the box bed I andoverhanging bracket-arm with a vertical standard 2 and horizontalportion 3 terminating in the head 4. The open bottom of the bed I isclosed by the bottom or baseplate 5.

the clip-belt to the bottom free-ended rotary shaft. I3 which isdisposed directly below the bracket-arm and is journaled in bearing lugsI4, I5 between the ends of the shaft I3 in the bed I.

Mounted on the free end of the bottom rotary shaft I3, remote from theclip-belt I2, is at least one of the feed-eccentrics, preferably thefeedlift eccentric I6, which is embraced by the feedbar I! carrying thefeed-dog [8. The feed-bar I1 is fulcrumed at its rearward end upon thepin I9 carried by the feed-rocker which is journaled on the pivot-shaft2| fixed in lugs in the bed I.

Connected to the pin I3, Fig. 6, is one end of the link 22 the oppositeforked end of which pivotally carries a cross-pin 23 which is free to 25fulcrumed at 26 in the bed I and rocked by the feed-advance eccentric 21on the bottom shaft I3. The stitch-length may be regulated, orevenreversed, by-shifting the link 22 to carry the cross-pin 23 toward oracross a position of axial coincidence with the yoke-fulcrum 26.

Such regulation may be effected by movement of the feed-regulator lever28 which is frictionally fulcrumed at 29 in the bed I and connected bythe link 30 to the link 22. v

Complemental to the needle 8 in the formation of stitches is theloop-taker or rotary hook which is a cup-shaped body carried by thevertical hook-shaft 3| and formed with a loop-taking beak 32. Within thehook-cup is disposed the usual stationary bobbin-case 33 which carriesthe usual bobbin or under thread mass, not shown. This bobbin-case isrestrained against rotation with the hook by means of the usualrotation-restraining tongue 34, Fig. 1, which freely enters a 'notch inthe under side of the throat-plate 35. I

The vertical hook-shaft. 3| carries the spiral a gear 40 of equal sizeon'the bottom rotary shaft l3. The rotary hook preferably makes tworevo- The bracket-arm head 4 carries the usual.

lutions to one revolution of the bottom'shaft I3. \The machine ispreferably provided with a bobbin-case opener or kicker 4|, Fig. 4,which is pivoted at 42 in the bed I and actuated by the eccentric 43 onthe countershaft 38. At the time when the needle-loop which has beencast about the bobbin-case 33 is being drawn up by the take-up I0 and isabout to be drawn between the rotation-restraining tongue 34 andtheengaged wall of the notch in the under sideof'the throat-plate, thekicker 4| engages the shoulder 44, Fig. 4, on the bobbin-case and turnsthe bob bin-case slightly or enough to open a gap or passageway for theneedle-loop adjacent the tongue 34. a

Journaled highrin the bed I, in rear of the bottom rotary shaft I3, isthe main-shaft 45. The main-shaft carries a small pinion 46 which mesheswith the larger gear on the shaft IS. The main-shaft also carries thebalancewheel and belt-pulley 41 which is connected by the belt 48 to thesmall pulley 49 on the shaft 50 of the small high-speed motor 5|disposed in the bed I, in front of the bottom rotary shaft I3. Thebalance-wheel 41; Fig. 1, due to the high position of the main-shaft,does not drag or encroach upon the base-plate 5, yet is of adequate sizeto effect a material speed reduction by the belt-connection 48. Thespeed-reducing gears 46, 40, effect a further speed reduction enablingthe machine to be operated at a moderate speed from a small high-speedelectric motor within the bed I.

By mounting the balance-wheel on a shaft which is geared down to thesewing machine mechanism, the weight of the balance-wheel may be reducedbelow the dictates of conventional practice, without loss of thenecessary balancing effect required for slow operation of the machine,as in embroidering and darning operations. This is an importantadvantage in an electrically driven family type machine where thedriving motor is permanently connected in driving relation with themachine and must be started and held at the desired running speeds bymanual operation of the usual rheostatic controller furnished with suchmachines.

Having thus set forth the nature of the invention, what I claim hereinis:

1. A sewing machine having a bed and over-- connection between saidbottom and top rotary shafts, a main-shaft journaled in said bed, abalance-wheel carried thereby, and speed-reducing gearing connectingsaid main-shaft to drive said bottom rotary shaft.

2. A sewing machine having a bed and overhanging bracket-arm, areciprocatory needle, a complemental loop-taker, a work-feeder, meansinterconnecting said needle, loop-taker and workfeeder to cause them tooperate in timed relation to each other, a conventional small high-speedelectric motor in said bed, a small driving belt pulley thereon, abalance-wheel shaft in. said bed, a balance-wheel and belt-pulleythereon, a belt-connection between said pulleys, and speedreductiongearing in said bed between said balance-wheel shaft and said means.

3. A sewing machine having a box-type bed and overhanging bracket-arm, areciprocatory needle and top rotary needle-driving shaft carried by thebracket-arm, a lower rotary shaft connected to drive the top rotaryshaft, a gear on said bottom rotary shaft, a vertical axis rotary hookcomplemental to said needle, a hook-driving countershaft parallel tosaid bottom rotary shaft and driven one-to-one by the gear on thelatter, two-to-one gearing connecting said vertical axis rotary hook tosaid hook-driving countershaft, work-feeding mechanism includingfeed-eccentrics carried by said lower rotary shaft, a mainshaftjournaled high in said bed, a balance-wheel on said shaft externally ofsaid bed, and a pinion on said shaft meshing with said gear on saidbottom rotary shaft.

4. The construction set forth in claim 3 with the hook-driving shaft setlower than and forwardly of the bottom rotary shaft which latter is setlower than and forwardly of the main-shaft.

5. A sewing machine having a box-bed, a hollow standard rising therefromand an overhanging bracket-arm carried by said standard, top and bottomshafts journaled, respectively, in said bed and bracket-arm, a beltconnection in said standard between said shafts, feed-eccentrics on saidbottom shaft, feeding means actuated by said eccentrics, a reciprocatoryneedle actuated by said top shaft, a rotary hook-shaft journaledvertically in said bed beyond one end of said bottom shaft, 8.countershaft journaled in said bed forwardly of said vertical hook-shaftand bottom rotary shaft and geared to both of said last mentionedshafts, and a main-shaft journaled in said bed and geared to said bottomshaft.

6. A sewing machine having a box bed and overhanging bracket-arm, abottom rotary shaft journaled in said bed directly below saidbracketarm, a reciprocatory needle carried by said bracket-arm,needle-driving mechanism actuated by said bottom rotary shaft andlocated within said bracket-arm, an electric motor disposed in said bedin front of said bottom rotary shaft, a main shaft journaled in said bedin rear of said bottom rotary shaft, a balance-wheel carried thereby, aspeed-reducing belt-connection between said motor and main-shaftexternally of said bed, a reduction gear connection between said mainshaft and said bottom rotary shaft within said bed, work-feedingmechanism in said bed including feed eccentrics on said bottom rotaryshaft, and a loop-taker complemental to said needle located in said bedand actuated by said bottom rotary shaft.

7. A sewing machine having a bed and overhanging bracket-arm,afree-ended lower rotary shaft journaled in said bed, feed-eccentricscarried by said lower rotary shaft at least one of which eccentrics isat one free end of said shaft, work-feeding mechanism actuated by saideccentrics, a reciprocatory needle carried by said bracket-arm, means atthe other free end of said lower rotary shaft connected to drive saidneedle, a loop-taker in said bed complemental to said needle in theformation of stitches, a countershaft parallel to and driven by saidlower rotary shaft for actuating said loop-taker, and a mainshaft insaid bed and connections for driving said lower rotary shaft therefrom.

8. A sewing machine having interconnected stitch-forming andwork-feeding mechanisms and including a machine shaft for driving saidmechanisms, a balance-wheel shaft, speed-reducing means permanentlyconnecting said balance-wheel shaft and said machine shaft,

whereby said balance-wheel shaft is caused to l run faster than saidmachine shaft, a balancewheel on said balance-wheel shaft, and anelectric motor permanently connected at all times to drive saidbalance-wheel shaft at a speed less 7 than the motor speed.

GEORGE A. FLECKENSTEIN,

